Check if a specific port is open on a server
The Port Checker by ToolsGenerate is a free online tool that scans servers and network devices to determine which ports are open, closed, or filtered. Whether you're troubleshooting network connectivity, verifying firewall rules, or performing security audits, our tool provides comprehensive port analysis.
Scan TCP and UDP ports, identify running services, and assess network security with detailed port status information.
Port checking is the process of scanning a network device to determine which ports are accessible and what services are running. It helps identify potential security vulnerabilities and network configuration issues.
Port checking includes:
Our tool performs comprehensive port scanning:
The tool provides:
Well-Known Ports (0-1023):
HTTP (80), HTTPS (443), SSH (22), FTP (21), Telnet (23), SMTP (25), DNS (53)
Registered Ports (1024-49151):
MySQL (3306), PostgreSQL (5432), RDP (3389), MongoDB (27017)
Dynamic Ports (49152-65535):
Temporary ports used by applications for outgoing connections.
Open Ports: Can be entry points for attacks. Close unnecessary ports.
Closed Ports: Reject connections. Better than open but still detectable.
Filtered Ports: Blocked by firewall. Most secure option for unused ports.
✔ Only scan networks you own or have permission to scan
✔ Close all unnecessary ports on production servers
✔ Use firewalls to filter unwanted port access
✔ Regularly audit open ports on critical systems
✔ Monitor ports for unauthorized changes
✔ Implement intrusion detection for port scanning
Regular port scanning helps maintain network security and identify potential vulnerabilities.
Find answers to common questions about our Port Checker
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